In Vaud, compare contractors using your roof, consumption and project scope. Check authorisations, professional status and written service terms instead of a general ranking.
Check the contractors Request the legal company name, comparable references and the division of work between the main contractor and subcontractors. Check authorisation for the electrical tasks. Swissolar membership and the Solarprofis label are different: verify status and activities in the current directory. Nearby premises guarantee neither competence nor repair response times.
Compare the same project Provide roof details, consumption and required functions. Compare models, layout, monthly generation, included work, exclusions and installed price. A generation forecast is not a contractual guarantee. Specify service costs, warranties and contacts. Request several suitable offers without treating three quotations as a legal requirement.
Define procedures and handover Identify the grid operator for the address and who handles each application. Pronovo provides project-specific procedures and permits third-party representation; check documents and timing. Specify payments, tests, handover records and service in the contract. A supplier name or “all-inclusive” claim cannot allocate every responsibility.
Vaud example: coordinate a phased renovation Consider an owner planning roof work first, then a heat pump and EV charging. This is a planning example, not a schedule shared by every Vaud home. Request two options: a system for current uses and a configuration prepared for future plans.
Name components to retain, anticipated adaptations and expansion limits. An “expandable” offer does not specify the inverter, interfaces, space or second-visit charges. Check roofer and electrician interfaces through understandable documents.
Compare construction sequencing. Who removes and reinstates protection? When can the roofer close the roof? Who checks cable routes before they become less accessible? A shared schedule helps compare responsibilities and mobilisation costs without assuming every job must go to one contractor.
Request documented handover at each stage and an updated final layout. Assess an option that will remain without storage or expansion. Choosing on assumed future prices can conceal necessary work; compare functions available today and written commitments.